CS5373A is a single-channel, high-performance, low-power, fourth-order Delta-Sigma modulator plus an integrated test DAC for sensor and electronics channel testing. The CS5378 is a multifunction digital filter utilizing a low-power signal processing architecture to achieve efficient filtering for Delta-Sigma modulators. When combined, the CS5373A and CS5378 produce a compact high-resolution, self-testing, analog-to-digital measurement system that is ideal for single-sensor seismic and geophysical applications.

The CS5373A modulator provides high dynamic range and low total harmonic distortion, while consuming significantly less power per channel than our previous generation seismic modulators. This modulator consumes 5 mA in normal operation, 220 µA when placed in sleep mode and by halting the input clock of the modulator it enters a power-down state using only 2 µA.

The CS5373A integrated Test DAC is a multifunction differential output digital-to-analog converter intended to test high-resolution, low-frequency measurement systems.

The dual outputs provide a precision output (OUT±) for testing the electronics channel and a buffered output (BUF±) for in-circuit sensor testing. DAC distortion performance (THD) is typically -116 dB from the precision output and -105 dB from the buffered output. Noise performance is 114 dB SNR over a 430 Hz bandwidth. Driven with a digital Delta-Sigma bit-stream from the CS5378 digital filter, the maximum AC analog output voltage is a differential 5 V peak-to- peak signal.

Low-power consumption, selectable attenuation, dual outputs and programmable test modes make this device ideal for testing single sensor seismic acquisition systems and geophysical instruments.